The Iowa Board of Medicine has named one of its staff members as the interim head of the organization following the unexplained departure of its former executive director.Kent Nebel, director of legal affairs of the Iowa Board of Medicine, was named as interim executive director of the state medical board with no public discussion during a brief meeting Thursday morning.Board members voters voted unanimously — with two members absent — to instate Nebel.The board’s previous executive director Mark Bowden retired at the end of last month — the same day, in fact, he was reinstated to the position by board members — following a back and forth scenario that has been left unexplained by officials.Bowden, a longtime former editor of The Gazette, had been placed on administrative leave for about a month due to undisclosed reasons before the board gathered to discuss his status in predominantly closed sessions on July 26.